actually, whilst it might be a good idea to go over some of the fundamental/more advanced concepts in maths, i'd say the most important thing is to be prepared to hit the ground running in September. You'll have exams in January, and if you end up needing to do resits, that *is* a lot of content to learn/revise/remember before June. People tend to doss for the couple of months, and that can screw you over a bit when it comes to the modular exams. Obviously it's quite do-able to resit in June, but it makes your life harder than it needs to be.